Method for cooperatively treating organic matter-containing solid hazardous waste substitute tailings in cement kiln

A technology of synergistic processing and organic matter, applied in cement production, solid fuel, waste fuel, etc., can solve problems that affect the stability of kiln conditions, aggravate the reducing crust of the smoke chamber, affect the combustion of pulverized coal in the kiln and kiln conditions, etc.

Active Publication Date: 2020-10-23
长沙紫宸科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (3) The incineration method of feeding materials into the grate cooler in the kiln hood, that is, putting the combustible waste directly into the grate cooler for incineration. First, it will easily affect the cooling quality of the clinker, and second, it will reduce the secondary air entering the kiln and the tertiary air entering the furnace. Oxygen concentration affects pulverized coal combustion and kiln conditions in kilns
The common defects of this kind of method: First, it is easy to cause the accumulated material in the kiln tail smoke chamber to stick and block
The second is that the heavy metals in the solid waste are not reduced, inhibited and pre-cured, which will easily cause the reduction and volatilization of heavy metals and the volatilization of chlor-alkali sulfur, which will aggravate the crusting of smoke chambers and shrinkage, affect the stability of kiln conditions, and increase heat consumption.
The third is that there is no transitional reduction and inhibition treatment for combustibles such as carbon-containing organic matter and sulfides in solid waste. The combustibles will aggravate the reduction crust of the smoke chamber and shrinkage
[0017] Clearly, existing technologies for alternative fuels containing hazardous waste containing organic matter are deficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this example, the solid pesticide waste whose warehouse number is HW04 in a hazardous waste disposal company is selected. The laboratory test of the cement plant shows that the moisture content is 0.37%, the loss on ignition is 76.18%, and the SiO 2 1.37%, Al 2 o 3 0.59%, Fe 2 o 3 0.85%, CaO 9.1%, MgO1.94%, K 2 O 0.06%, Na 2 O 3.49%, Cl - 3.11%, S 2.95%, F 0.35%, low calorific value 4127Kcal / Kg.

[0041] The reduction inhibitor used in this embodiment selects potassium ferrate, sodium percarbonate, lithium nitrate for use, and wherein the mass ratio of potassium ferrate, sodium percarbonate, lithium nitrate is 1: 1.8: 4; Stabilizer selects potassium silicate, polyvinyl alcohol for use , wherein the mass ratio of potassium silicate and polyvinyl alcohol is 30:1; the reduction inhibitor and stabilizer are made into a 35% concentration solution for use.

[0042] The present embodiment carries out as follows:

[0043] (1) Modification treatment: In the pretrea...

Embodiment 2

[0057] In this example, a hazardous waste disposal company’s warehouse number is selected as HW49 solid hazardous waste. The laboratory sampling test: pH value 7-8, moisture 7.56-27.54%, loss on ignition 20.98-88.62%, SiO 2 0.87~4.84%, Al 2 o 3 0.91~3.96%, Fe 2 o 3 3.86~15.76%, CaO 0.76~3.84%, MgO 0.11~1.36%, K 2 O 0.08~0.39%, Na 2 O 4.31~8.64%, Cl - 0.46~2.31%, S 0.03~0.82%, F 0.00~0.02%, low calorific value 1987~6143Kcal / Kg.

[0058] The reduction inhibitor used in this embodiment selects sodium percarbonate and cerium nitrate, wherein the mass ratio of sodium percarbonate and cerium nitrate is 1:4; the stabilizer selects sodium silicate and polyvinyl alcohol, wherein the sodium silicate, polyvinyl alcohol The mass ratio is 30:1; the reduction inhibitor and the stabilizer are made into a 35% solution; lime is used as an auxiliary material.

[0059] The present embodiment carries out as follows:

[0060] (1) Modification treatment: During the pretreatment process ...

Embodiment 3

[0073] In this embodiment, the solid organic resin waste whose warehouse code is HW13 in a hazardous waste disposal company is selected, and it is checked to be a mixture of paint slag and the like. Laboratory sampling test: pH value 7.5-8.5, moisture 6.4-78.6%, loss on ignition 61.85-80.63%, SiO 2

[0074] 0.87~6.27%, Al 2 o 3 0.14~1.57%, Fe 2 o 3 0.03~1.64%, CaO 6.96~14.98%, MgO 0.09~0.31%, K 2 O 0.02~0.13%, Na 2 O 0.11~0.29%, Cl - 0.09~0.12%, S 0.00~0.12%, F 0.00~0.01%, low calorific value 1574~6583Kcal / Kg.

[0075] The reduction inhibitor used in the present embodiment selects potassium ferrate, sodium percarbonate, cerium nitrate for use, and the mass ratio of potassium ferrate, sodium percarbonate, cerium nitrate is 1: 1.5: 4; Agents and stabilizers are used as 35% concentration solution; bentonite is selected as auxiliary material.

[0076] The present embodiment carries out as follows:

[0077] (1) Modification treatment: In the pretreatment process of sol...

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Abstract

The invention discloses a method for cooperatively treating organic matter-containing solid hazardous waste substitute tailings in a cement kiln. The method comprises the following steps: (1) modification treatment; (2) dehydrating and preheating; and (3) burning in a decomposing furnace. The method is simple to operate, low in treatment energy consumption, low in treatment cost and free of secondary pollution; and (2) the carbon-containing organic matter solid hazardous waste can effectively replace part of silicon-aluminum raw materials and about 60-65% of fire coal required by dry-process cement production, so that energy conservation, emission reduction, cost reduction and benefit increase of cement enterprises are facilitated.

Description

technical field [0001] The invention relates to a treatment method for hazardous solid waste containing organic matter, in particular to a method for co-processing hazardous waste containing organic solid waste in a cement kiln instead of tailing coal. Background technique [0002] Hazardous waste in my country is characterized by a large amount of production, many types, and a wide range of sources. The "National Hazardous Waste List" (2016 Edition) divides hazardous waste into 46 categories, a total of 479 types, of which carbon-containing organic hazardous waste accounts for A lot of weight. In the past 20 years, my country has formed three major types of disposal technologies, mainly incineration disposal technology, solidification and stabilization technology, and cement kiln co-processing. At present, the co-processing of hazardous waste in cement kilns has become one of the most important and effective technical approaches. [0003] In the past ten years, the relevan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/44C10L5/48
CPCC04B7/4423C10L5/48C10L2290/08C10L2290/24Y02P40/125
Inventor 尹小林余智英宋剑飞
Owner 长沙紫宸科技开发有限公司
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